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If it slowly drops and does not run out through Test Cock No. 2, then No. 2 ball valve has a small leak, but No. 1 check valve is tight. 如果水柱慢慢下降，并且没有从测试旋塞2号流出，则2号球阀有点泄漏，但是1号止回阀密封紧密。